mrtime
Newbie level 4
In many LC-VCO circuits there is always a series resistor between the control voltage and the varactors, what's the intention of this design?
One guess is to prevent the high-frequency noise on the voltage control line to enter the VCO and complete a AM-FM process, but at the same time this resistor introduce thermal noise which deteriorate the phase noise.
One guess is to prevent the high-frequency noise on the voltage control line to enter the VCO and complete a AM-FM process, but at the same time this resistor introduce thermal noise which deteriorate the phase noise.